qa/tasks/cephadm.py: add ceph logs directory in job's info.yaml

qa/tasks/cephadm.py: add ceph logs directory in job's info.yaml

This commit adds the file path of ceph log directories to the job's
info.yaml log file. The motivation behind this is, in case of job
timeout, the logs would still be tranferred to teuthology host
before nuking test machines using these ceph log directory paths in
job's info.yaml log file.

Signed-off-by: Shraddha Agrawal <shraddha.agrawal000@gmail.com>
(cherry picked from commit d2ff5c5eb609eba02e6c966015bb7e1d9b349be4)

Conflicts:
	qa/tasks/cephadm.py